In 1997, Westwood Studios followed up the movie with a computer game of the same name. It certainly wasn't the first game based on a movie, but thus far it's one the best. Many of the crew who worked on the game also did the original film (including Sean Young providing the voice for Rachel), and it showcases some fairly sophisticated game elements like multiple decision-based storylines leading to multiple endings (I've been able to find 8 so far, but I hear there are as many as 17) and seamless cinematic/gameplay transitions. Spanning 4 full CD's, it was huge by 1997 standards, and fortunately has aged very, very well. It's based on the movie a little too much (some of the story points, such as looking for the scale in the hotel bathroom, make no sense unless you've seen the movie), but still stands as one of the best computer games ever.